Our founder, Nishiyama, grew up in an environment where hot springs were a part of daily life from childhood to adulthood. Even after moving to Tokyo for work, he would make it a point to visit local hot springs during business trips. However, when he relocated overseas at the age of 31, he could no longer enjoy hot springs—a longing that eventually led to the inception of the “Portable ONSEN” project.

Upon returning to Japan, he and his fellow hot spring and sauna enthusiasts sought to create a way to enjoy hot springs anytime, anywhere. Their journey began with a fundamental question: What exactly is a hot spring? While hot springs are deeply embedded in Japanese culture and provide an undeniably pleasant experience, few people truly understand their composition. 　　　

Through research, they discovered that hot springs consist of 99% water and less than 1% minerals. This sparked the idea—What if we could extract only the minerals?

They began experimenting with machinery designed to evaporate water and isolate mineral components, but after two years of trials, they faced significant challenges:

- The process was extremely time-consuming, making mass production unfeasible.
- The evaporation and filtration process increased the risk of bacterial growth.
- Even when successful, the concentration levels were too low, requiring large amounts per use (500ml–1L per bath), making it impractical for daily use.

The most crucial factor here is how to increase the concentration of minerals.

At this critical juncture, a miraculous encounter changed everything. They met Mr.Tada from Arashi no Yu, a company with over 20 years of experience in mineral research and mineral mist bath facility development. Their shared vision and passion led to an instant partnership. With the expertise of Arashi no Yu, medical doctors, university professors, and our team, they embarked on a mission to develop a concentrated thermal spring solution using the finest natural hot spring sources—all while maintaining “100% natural purity” as an absolute requirement. 　　　

The team delved deeper into key questions:
- How are hot springs formed?
- What are their mineral compositions?
- What are the health benefits of minerals in hot springs?
- How can we effectively communicate the uniqueness, safety, and value of our product?
- Why is it crucial to avoid additives and artificial coloring?

Through meticulous research and innovation, they “successfully developed an entirely new approach to concentrated thermal spring solutions”.
Now, with a team comprising hot spring experts, mineral researchers, university professors, doctors, beauty specialists, and wellness professionals, they are ready to introduce a revolutionary product to the world.